On the Reproducibility and Directionality of Underwater Laser-induced Acoustic Signal

Abstract An intense laser pulse focused in water could induce plasma expansion, which can be used as an impulsive sound source. The optoacoustic underwater source is very useful marine applications; however, the poor reproductivity and sharp directivity of emitted signals a big problem. acoustic emission by breakdown are measured laboratory experiment this paper, results show that both direction-dependent. measurement also shows feasibility improving adjusting focusing system beam.